diff --git a/claude_code_log/html/__init__.py b/claude_code_log/html/__init__.py
index 2bfd2c6..308c434 100644
--- a/claude_code_log/html/__init__.py
+++ b/claude_code_log/html/__init__.py
@@ -20,6 +20,7 @@
     format_askuserquestion_input,
     format_bash_input,
     format_edit_input,
+    format_grep_input,
     format_exitplanmode_input,
     format_multiedit_input,
     format_read_input,
@@ -105,6 +106,7 @@
     "format_askuserquestion_input",
     "format_bash_input",
     "format_edit_input",
+    "format_grep_input",
     "format_exitplanmode_input",
     "format_multiedit_input",
     "format_read_input",
diff --git a/claude_code_log/html/renderer.py b/claude_code_log/html/renderer.py
index 8d22a37..4a3fb40 100644
--- a/claude_code_log/html/renderer.py
+++ b/claude_code_log/html/renderer.py
@@ -30,6 +30,7 @@
     EditInput,
     ExitPlanModeInput,
     GlobInput,
+    GrepInput,
     MultiEditInput,
     ReadInput,
     TaskInput,
@@ -92,6 +93,7 @@
     format_edit_input,
     format_edit_output,
     format_exitplanmode_input,
+    format_grep_input,
     format_exitplanmode_output,
     format_multiedit_input,
     format_read_input,
@@ -310,6 +312,10 @@ def format_ExitPlanModeInput(
         """Format → empty string (no content)."""
         return format_exitplanmode_input(input)
 
+    def format_GrepInput(self, input: GrepInput, _: TemplateMessage) -> str:
+        """Format → pattern + params (path, glob, type, mode)."""
+        return format_grep_input(input)
+
     def format_WebSearchInput(self, input: WebSearchInput, _: TemplateMessage) -> str:
         """Format → search query display."""
         return format_websearch_input(input)
@@ -445,6 +451,10 @@ def title_GlobInput(self, input: GlobInput, message: TemplateMessage) -> str:
             summary = f"{summary} in {input.path}"
         return self._tool_title(message, "🔍", summary)
 
+    def title_GrepInput(self, input: GrepInput, message: TemplateMessage) -> str:
+        """Title → '🔎 Grep `pattern`'."""
+        return self._tool_title(message, "🔎", input.pattern)
+
     def title_BashInput(self, input: BashInput, message: TemplateMessage) -> str:
         """Title → '💻 Bash <description>'."""
         return self._tool_title(message, "💻", input.description)
diff --git a/claude_code_log/html/tool_formatters.py b/claude_code_log/html/tool_formatters.py
index 8873eab..106cb91 100644
--- a/claude_code_log/html/tool_formatters.py
+++ b/claude_code_log/html/tool_formatters.py
@@ -36,6 +36,7 @@
     EditOutput,
     ExitPlanModeInput,
     ExitPlanModeOutput,
+    GrepInput,
     MultiEditInput,
     ReadInput,
     ReadOutput,
@@ -268,6 +269,33 @@ def format_websearch_output(output: WebSearchOutput) -> str:
     return render_markdown_collapsible(markdown_content, "websearch-results")
 
 
+# -- Grep Tool ----------------------------------------------------------------
+
+
+def format_grep_input(grep_input: GrepInput) -> str:
+    """Format Grep tool use content showing search parameters.
+
+    Args:
+        grep_input: Typed GrepInput with pattern, path, glob, type, etc.
+
+    Each field is shown on its own line with a consistent label: value format.
+    """
+    html_parts = ["<div class='grep-tool-content'>"]
+    html_parts.append(f"<div class='grep-tool-field'><span class='grep-tool-label'>pattern:</span> <code>{escape_html(grep_input.pattern)}</code></div>")
+    if grep_input.path:
+        html_parts.append(f"<div class='grep-tool-field'><span class='grep-tool-label'>path:</span> <code>{escape_html(grep_input.path)}</code></div>")
+    if grep_input.glob:
+        html_parts.append(f"<div class='grep-tool-field'><span class='grep-tool-label'>glob:</span> <code>{escape_html(grep_input.glob)}</code></div>")
+    if grep_input.type:
+        html_parts.append(f"<div class='grep-tool-field'><span class='grep-tool-label'>type:</span> <code>{escape_html(grep_input.type)}</code></div>")
+    if grep_input.output_mode:
+        html_parts.append(f"<div class='grep-tool-field'><span class='grep-tool-label'>mode:</span> <code>{escape_html(grep_input.output_mode)}</code></div>")
+    if grep_input.multiline:
+        html_parts.append(f"<div class='grep-tool-field'><span class='grep-tool-label'>multiline:</span> <code>true</code></div>")
+    html_parts.append("</div>")
+    return "".join(html_parts)
+
+
 # -- TodoWrite Tool -----------------------------------------------------------
 
 
@@ -832,6 +860,7 @@ def format_tool_result_content_raw(tool_result: ToolResultContent) -> str:
     "format_edit_input",
     "format_multiedit_input",
     "format_bash_input",
+    "format_grep_input",
     "format_task_input",
     "format_websearch_input",
     "format_webfetch_input",